Wall lamp



FIG. 1 is a perspective view taken from the front and left side of a wall lamp showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof, the opposite side being a mirror image;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a wall lamp, as shown and described. 